Java programs which require a specific version of java won't work

So I'm running 10.4 on my macbook pro, and when I try to run a java program that requires any version of java, I get an error saying I don't have that version. Java works fine from the command line when I run programs I wrote, and java -version outputs:
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-275)
Java HotSpot(TM) Client VM (build 1.5.0_16-132, mixed mode, sharing)
When I try to run something (say, some java applet), I get the message:
Could not launch the application because it requires a version of Java that is not installed.
(in smaller print):
This application requires Java 1.4 or later, but only the following Java versions are installed: . Updating to a newer version of Mac OS X may resolve this.
The message makes me think that in some text file or some preference somewhere, the thing that tells the system what version of Java I have got deleted. Anyone have any ideas of something I can do to fix it?

I usually use Win 7 and lately have been playing with the Win 10 preview. I like Win 7.

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Mark.
[1.4 is EOL|http://java.sun.com/j2se/1.4.2/] so I suggest you target 1.5.
Youe contention that world should not change because a small proption of near-sighted troglodites insist on wearing frilly collars is complete bunkum. Get over it. Fast.
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... or maybe one would prefer the MS .NET platform, where no version is at all backwards compatible with any previous one; is supported for just three years; with each CLR occupying a full third of ones modest laptop hard disk?
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~~ anonCheers. Keith.
Edited by: corlettk on 19/04/2009 16:27 ~~ Typoes!

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Java programs which require a specific version of java won't work

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